Laserfiche WebLink
Southwest District Ventilation Borehole. Powerline and Access Road <br />The Southwest District Ventilation Borehole, Powerline and Access Road required a minor amount of work in <br />order to reclaim the sites. The work included building and duct-work removal, fan removal, demolition of <br />concrete pads, removal of concrete, permanently sealing the shaft opening, powerline and pole removal, road <br />removal, topsoil replacement, and seeding. <br />Final reclamation of the 36-inch diameter casing involved placing afive-foot cement plug at the bottom of the <br />cased hole. The casing was backfilled from the plug to within 10 feet of the surface. The top 3 feet of the <br />casing was cut off, a 7 foot cement plug was placed in the remaining casing, and the remaining 3-foot hole <br />backfilled with subsoil. The access road was graded to blend with the surrounding terrain, and the culvert <br />removed. The ventilation borehole pad and access road were topsoiled and seeded with the appropriate seed <br />mixture. <br />0-Entry Ventilation Shaft <br />The 0-Entry ventilation shaft reclamation work will require building and duct-work removal, fan removal, <br />demolition of foundations, removal of concrete, sealing of the shaft, regrading of the fan site, and replacement <br />of plant growth media. It is anticipated that this fan will remain until all mining operations have been completed <br />at the Foidel Creek Mine. <br />Final reclamation of the shaft will involve will involve constnuion and placement of apre-fabricated fiamework <br />of steel support beams, steel composite decking and 4 inches of concrete to be placed approximately 10 feet below <br />grade. Prior to construction of and placement of the decking, however, the concrete foundation will be broken up <br />and put down the shaft. The support beams and decking will be suspended from the concrete liner by steel straps <br />(i.e. I-beams or similaz support structures) welded to the support beams. The steel straps will be tied into notches <br />cutout of the top of the liner. C!nce this is completed, a 24-inch thick reinforced concrete slab will be constructed <br />over the previously placed slab and decking. The void from on top of the concrete slab to within 5 feet of the <br />surface will be backfilled with fill material (approximately 20 C1~ from the surrounding area. The next 2 feet of <br />the shaft will then be filled with concrete to form a top plug for the shaft. Fill material will be placed in the <br />remaining 3 feet of the shaft (approximately 22 Cl~ and then the plant growth media placed over the site. <br />The duct-work, buildings and foundation materials will be removed and placed in the backfilled portal area. <br />The materials will be crashed to minimize the volume to be added to the pit. The materials will then be covered <br />during the backfilling of the facilities. The material excavated from the site and placed in the Equipment <br />Storage area will be returned to the site. It is anticipated the material will be dozed back to the site and sloped to <br />conform with the approved postmining topography. The plant-growth material will be retumed to the site and <br />seeded. The fan and power-poles will be removed from the property and placed in an appropriate landfill. <br />Washolant Powerlines <br />When the washplant powerlines aze no longer needed, they will be dismantled and the powerline components <br />(conductors, insulators, cross-bars, and poles) removed from the site. Any holes remaining after pole removal <br />will be backfilled with materials from the site, and the surface leveled and seeded with the rangeland seed <br />mixture. <br />Washnlant Waterlines <br />When the washplant waterlines are no longer needed, the surface portion of the waterlines, pumphouse and <br />power line will be dismantled and removed from the site. Buried portions of the pipelines will be stubbed-off <br />below grade, capped, and buried. <br />MR07-222 2.05-104 08/28/07 <br />